package the_art_of_java_concurrency_programming.concurrent.Thread;

import java.sql.Time;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

/**
 * @Author: 李浩然
 * @Date: 2021/4/20 10:12 上午
 */
public class WaitNotify {
    static boolean flag = true;
    static Object lock = new Object();

    public static void main(String[] args) throws InterruptedException {
        Thread waitThread = new Thread(new Wait(), "WaitThread");
        waitThread.start();
        TimeUnit.SECONDS.sleep(1);
        Thread notifyThread = new Thread(new Notify(), "NotifyThread");
        notifyThread.start();
    }

    static class Wait implements Runnable {
        public void run() {
            //加锁，拥有lock的Monitor
            synchronized (lock) {
                //当条件不满足时继续wait
                while (flag) {
                    try {
                        System.out.println(Thread.currentThread() + " flag is true. wait@ " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println(Thread.currentThread() + " flag is false. wait@ " + new SimpleDateFormat("HH:mm:ss").format(new Date()));

            }
        }
    }

    static class Notify implements Runnable {
        public void run() {
            //加锁，拥有lock的Monitor
            synchronized (lock) {
                //获取lock的锁，然后进行通知，通知时不会释放lock的锁
                //直到当前线程释放了lock的锁
                System.out.println(Thread.currentThread() + " hold lock. notify @ " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                lock.notifyAll();
                flag = false;
                SleepUtils.second(5);
            }
            //再次加锁
            synchronized (lock) {
                System.out.println(Thread.currentThread() + " hold lock again. notify @ " + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                SleepUtils.second(5);
            }

        }
    }
}
